Patent GB-373719-A (GB)
Title: Improvements relating to lubricating apparatus
IPC: F16N13/08
Filed: 1931-04-08
Abstract: 373,719. Force - feed lubricating. TRIGGS, W. W., 57, Lincoln's Inn Fields, London.-(Lubrication Devices, Inc. ; 53, South Washington Avenue, Battle Creek, Michigan, U.S.A.) April 8, 1931, No. 10341. [Class 12 (iii).] A lubricating system comprises a reciproacting pump feeding a branched piping system 43, Fig. 2, having, adjacent each part 45, Fig. 6, to be lubricated, a fitting 44 containing a leaky piston 64 which is depressed by the entering lubricant so as to deliver the lubricant beneath it past a spring-loaded check valve 56 until the piston seats on a shoulder 67 and which, when the pressure is relieved, is again raised by a light spring 66 interposed between the piston and the valve 56 so that lubricant passes from above to below the piston, and a valve 28, Fig. 2, actuated by the pump plunger 16 during the latter part of its discharge stroke operates to effect relief of pressure in the piping so as to permit the self-restoring movements of the pistons 64 prior to the completion of the discharge stroke of the plunger. The stroke of each piston 64 is determined by an adjustable threaded sleeve 61 limiting the upward movement of the piston and fitted with a filtering screen 63. The tubular valve 28 moves in a chamber 27 coaxial with the pump barrel 15 and has a reduced extension adapted to be engaged by the plunger 16, the valve being normally maintained by a spring 30 with its shoulder 29 against the end of the barrel 15. On the discharge stroke of the plunger 16, which is effected by a spring 21, lubricant is discharged through an outlet port 39, controlled by a spring-loaded check valve 41, to the piping 43 until normally all the pistons 64 are seated on the corresponding shoulders 67, thus stopping the flow. As the discharge stroke continues, the plunger engages the valve 28 and the surplus lubricant is forced through a passage 69 into a chamber 33 housing a spring- loaded piston 36 normally closing a port 35 communicating with a supply chamber 13 separated from a lubricant tank 10 by a wire screen 12, and the lubricant is forced slowly through a filter plug 38 in the piston 36 into the chamber 13. The movement of the plunger is thus greatly retarded, whilst the pressure in the pipe 43 is maintained. In the event of one or more of the bearings 45 to be supplied being tight, this sustained pressure ensures the supply of lubricant thereto even if the piston 64 cannot seat on the shoulder 67. As the valve 28 is moved, it uncovers, prior to the end of the stroke, the intake port 31 from the chamber 13 and a port 40 leading from a chamber 48 which communicates through a port 49 with the outlet passage below the valve 41, the port 49 being controlled by a very lightlyloaded check valve 51. The pump pressure and the pressure on the pipe 43 are thus relieved and the plunger 16 moves quickly to the end of its stroke. On the suction stroke, which is effected by hand, lubricant is drawn in from the chamber 13 through the port 31 until that port is covered by the valve 28 and thereafter through an auxiliary port 32 leading from the chamber 33. The port 32 is normally covered by the piston 36, but the latter is moved to open it and the port 35 by the suction action.